Regenerative braking systems are a type of braking system commonly found in electric and hybrid vehicles. These systems use the energy generated during braking to recharge the vehicle's battery.

When a driver applies the brakes in a vehicle with a regenerative braking system, the electric motor that powers the vehicle becomes a generator. This generates electricity, which is then stored in the vehicle's battery. By using this energy to recharge the battery, the vehicle's range is extended, and less energy needs to be consumed from the battery to power the vehicle.

Regenerative braking systems can save energy in several ways. First, they help to extend the life of the vehicle's battery by recharging it during braking. Second, they help to improve the vehicle's fuel efficiency by reducing the amount of energy needed to power the vehicle. Third, regenerative braking systems can also improve vehicle performance by providing instant torque and increased power during acceleration.

Overall, regenerative braking systems are an efficient and effective way to save energy in vehicles. They help to improve fuel efficiency, extend the life of the vehicle's battery, and improve vehicle performance.